#include <bits/stdc++.h>
using ll = long long;
using namespace std;
int main() {
std::ios_base::sync_with_stdio(false);
std::cin.tie(nullptr);
ll l, r;
cin >> l >> r;
for (int i = 0; i < r; i++) {
ll x;
cin >> x;
if (r == 1 and x == 1) {
ll a;
cin >> a;
if (a == l) {
cout << a << "\n";
} else {
cout << 0 << "\n";
}
return 0;
}
}
}
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